Selective system and apparatus



Oct. 25, 1932. E. E. KLEINSCHMAIDT 1,884,745

SELECTIVE SYSTEM AND APPARATUS Filed Jan. 23, 1931, 2 Sheets-Sheet l INVENTOR M3 50mm 5 IILEINSCHMIDFT BY 7 M ATTORNEY Oct. 25, 1932. E. E. KLEINSCHMIDT' SELECTIVE SYSTEM AND APPARATUS Filed Jan. 23, 1931 2 Sheets-Sheet 2 E N R O T T A a false signal unless the markingpulse thus Patented Oct. 25, 1932 A UNITED STATES PATENT. OFFICE EDWARD E. KLEIIN'SCHMIDT, OF PARK RIDGE, ILLINOIS, ASSIGNOR TO TELETYIP'E CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE SELECTIVE SYSTEM AND APPARATUEs Application filed January 23, 1931. Setialflo. 510,797.

The present inventionrelates to selecting mechanism and particularly to improvements in mechanical selecting mechanism for telea mechanism for start-stop control of -what slower angular velocity.

'mechanicalselectors of such types as include the well-known Baudot, Potts and Teletype mechanical selectors.v

Common to all of these selectors is a constantly rotating shaft, part of which may be periodically interrupted to efiect synchronization with a transmitting shaft of some These selectors are controlled by si nals of two kinds usually designated as marklng and -spacing signals. The mechanism is here def scribed with reference to a marking condiproper positionof the receiver for so securtion of closed circuit and a spacing conditionof open circuit, and the circuit is normally closed when no signals are being transmitted.

It is apparent that in such selective devices wherein is used a start impulse of one characteristic and a stop impulse of another characteristic, there is possible a continuous uncontrolled rotation of the selector elements wheh the signal line is allowed to remain indefinitely in the start. impulse condition.

This condition is prevalent in some telegraph switching systems while connections are be ing set up as in an exchange system, or when the line is left open negligentlyor for any other reason. When a receiver is thus allowed to rotate uncontrolled and is then stopped by a marking impulse there results transmitted happens to coincide with the ing a stop impulse. The probabilities of such a coincident stopping are remote so that this susceptibility to false signals may be said to be general among this class of receivers.

' It is accordingly a salient object of this invention to provide a selecting mechanism which hasspecial means to prevent-false operation of the receiver under certain conditions.

Another object of this invention is to provide a start-stop selector controlled by line signals of which the stopping means is effective to stop the selector for more than one kind of line impulse.

' Another object of this invention is to provide a method of efiectuating a coordination between the transmitter and receiver mechanisms under special conditions where otherwise a false relationship might existduring .a single cycle.

' Another object of this invention is to provide a single magnet selectin mechanism that is simple in structure, lig t in weight, and durable. in operation.

Another object of this invention is to provide a mechanical selecting means that is compact, positiveln operation and of a. minimum number of moving parts. 7

v Another object of this invention is to rovide a selecting mechanism wherein the ine. may be left open without incurring the liability that a false signal be received-upon itsbeing closed again.

Other objects of this invention will ap: pear in the course of description of its oper- I ation and in'the specification, drawings and claims accompanying herewith.

Referring to the drawings:

' Figure 1 is a perspective'view of the device l Figure 6, is a perspective view illustrating the arrangement of the particular parts of the selector featuring the pull bars and selector bars. i

stop con- Figure 7 is a cross-sectional view taken approximately on line 77 of Figure 4 showing the bellcrank mechanism for disengaging the cam sleeve.

Figure 8 is an assembly view showing the relation of the notched code-bars and their restoring lever.

In the following description corresponding parts relating to those of Patent 1,811,131 are similarly labeled.

Referring now to Figure 1, 160 indicates a main drive shaft coupled at 211 by a friction clutch. The driving shaft 161 is provided with an integral shouldered portion 212 havin a tongue and groove engagement 213 with a floating member 164 which is adapted to be urged longitudinally of the shaft and forms part of the friction clutch 211. A spring 214 is interposed between the shoulder 212 and the floating member 164 to effect a constant pressure against the friction element 163 and disc 162 of the driven start-stop shaft 161.

Secured to the shaft 161 are the several selector cams 186-each having a depression 191 on its periphery. The several selector cams 186 which correspond in number to the number of selective signal impulses that comprise a un t code signal, are closely disposed to each other and the depressions 191 on the selector cam assembly are successively in advance of each other in order that only one such depression may pass a given point at a time during'the rotation of the assembly.

A selector lever 215 is provided for each cam 186 and'the several levers are mounted in alignment for rotation on a shaft 193 parallel to the main shaft 161. These levers 215 are substantially T-shaped' and have their pivot atthe junction of their arms. The follower arms 192 of the levers 215 are disposed to ride on the cams 186, due to individual springs 197, the selector bar arms 195 are each adapted to engage a selector bar 216 or an other element that may ultimately effect a se ection, and the locking arms 194 are adapted to be disposed over the armature 17 9 as will hereinafter be more fully explained.

A stop arm 169 is affixed to the driven.

shaft 161 and may restrain said shaft from a rotation by engagement-with 'a. tooth 170.

Secured to the tooth 170 for rotation with it at pivot 171 is an arm 173 having attached to it a spring 174 which is disposed to urge the I arm and tooth in clockwise rotation against a fixed stop 175. -Another T-lever 217 is pivoted at 176' and has its arms radiating from said pivot. One arm 177 is disposed between pins 180 secured to depending portion 218 of the armature 179 so that movement of the armature is adapted to effect corresponding movement of the arm 177 in opposite angular direction. Another arm 176 of the T-lever 217 is normally disposed over the end of arm 173, while the remaining, arm 219 terminates in a laterally disposed blocking portion 221 which under certain conditions is adapted to be introduced into the path of a revolving stop pin 185, extending from one of the selector cams 186.

The armature 179 is pivoted at 222 and may occupy either of two positions in accordance with the nature of the line signals Its position indicated in Figure 2 prevail.- when magnet 183 is energized, the counterclockwise movement of the armature being limited by the adjusting screw 184. During such an interval the end 196 of armature 179 clears the locking arms 194 so that the levers 215 may assume the position indicated in dotted lines. During this interval the lever 217 has been rotated to its clockwise limit and the arm 17 6 is disposed to block the arm 173 against counterclockwise rotation, and the blocking ortion 221 of arm 219 is out of the path of t e revolving stop pin 185.

During the deenergized interval of magnet 183 its armature is free to respond to the influence of spring 181 and come to rest at its upper limit defined by adjusting screw 182 as indicated in Figure 3. In this position the end 196 of armature 179 is disposed in the path of movement of arm 194 and the selecting levers 215 are thus prevented from counterclockwise rotation. The T-lever 217 thus is at its counterclockwise limitand the blocking portion 221 is in the path of the stop pin 185.

To understand the movements of this device during a cycle of operation a set of arbitrary selecting signals may be taken consisting of a start signal which is of spacing nature, then signals of spacing, spacing,

marking, spacing and spacing nature, and a chronizing the transmitter and receiver mechanisms.

During the transmission of-this set of signals the shaft 161 makes but one revolution. The start impulse being of spacing nature, the magnet is deenergized and the armature assumes the position indicated in Figure 3. T-lever 217 is at its counterclockwise limit and arm 173 is free of arm 17 6 so that the superior force exerted by the rotating shaft 161 through the stop arm 169 against tooth overcomes the resistance of spring 174, the tooth yields and the shaft 161 and all its secured members begin their cycle of rotation. The first code impulse being of spacing nature the armature remains in the position of Figure 3' and the depression of the first selecting cam 186 registers under the follower arm 192 of its selecting lever 215. The arm 192, however, can follow only a short distance into the depression 191' because the other arm 194 of the lever 215 is blocked by 17 degrees. Inv

which the second, fourth and fifth code signals are received and the corresponding cams register opposite their selector levers; but during the third interval a marking impulse is received and the armature assumes the position indicated in Figure 2. When in that event, the third cam depression 191 registers under its follower arm 192 the third selecting lever 215 will rotate into the position indicated in dotted lines.

Just as the fifth code impulse is received and the corresponding cam depression 191 passes under its follower arm 192 the stop pin185 approaches the position indicated in Figure 3 and finds the blocking portion 221 in its path because the particular impulse is spacing and the lever 217 is directed to this position by every spacing impulse. The shaft 161 and its several members are stopped momentarily until the final stop signal which is marking is received to efiect the energization of. magnet 183. The armature 179 then is attracted and restores the condition of Figure 2 where the stop member 169 again restrains the shaft 161 at the completion of one cycle. Where the fifth code signal is not spacing as in the arbitrary example taken, but is marking, the stop pin 185 is not intercepted, but is allowed to proceed uninterruptedly to the position of Figure 2.

The operation-of the auxiliary stop will vary according to the angle between the normal stop and the auxiliary stop, which angle will vary with the location of the pin 185 upon the assembly of cams 186, and with the adjustment of the stop arm 169 upon the start-stop shaft 161. In Fig. 3 the angle between the; two sto ig. 2 the angle isshown about 32 degrees. For-the efi'ect described in the last paragraph above, the angle may be from '30 to 50 degrees, as shown in Fig; 2.

A desirable angle is to degrees, as

shown in Fig. 3 1n which condition of adjustment the auxiliary stop elements 185-221 will not engage to stop when the angular speed of the shaft 161 is normal according to design, but will engage when the fifth selective si al is spacing and the angular speed of t e shaft 161 is so high that the pin 185 engages the block 221 before the fifth selectivesignal has ceased, thus permitting the auxiliary stop to act to regulate the speed of the receiver when such regulation is des'rable but not at other times. With either adjust- .ment, the auxiliary stop is operable upon a spacing slgnal received from an open line.

The extra stop provided by pin 185 is for the purpose of preventing needless rotation of selector cams 186 that causes false opera tion under certain conditions. Without this positions is shown about stop, if the line is left open accidentally the cams 186 will rotate continuously until the line is again closed and since the cams may be in any angular position when the line is closed a false signal will usually be received and when the line is open again part of the' machine will be operating. In some methods of switching used in intercommunication systems or in telegraph exchange systems the line may be open during part of the operation. This device prevents the printing of false characters resulting from such intervals.

lln Figures 4 to 7 inclusive the present invention is shown applied to a mechanical selector generally similar to the one indicated in Patent 1,811,131. @nly so muchof the present device is here indicated as will assist in disclosing the general operation without unnecessary repetition. It is to be understood that the alternative stop means disclosed in Figures 1 to 3 inclusive, as well as the other omitted parts also form part of this general disclosure.

A group of code bars 59 are horizontally supported in spaced parallel alignment for free longitudinally slidable movement. Being supported edgewise, the several code bars 59 dispose their upperedges 224 subjacent a plurality of pull bars 108 each of which is adapted by actuation thereof. to effect the operation of a particular function such as the movement of a typebar. The upper edges 224 of the code bars 59 are variously notched as at 225 in the portions thereof that are under the pull bars 108. These notches 225 of the several bars 59 are so designed that for each permutative position of the set of bars 59 one and only one transverse row of notches 225 comes 1nto alignment whereby to admit the entrance thereinto of a pull bar 108. While one pull bar 108 is admitted the remaining ones are blocked by one or more of the code bars 59 whose corresponding notch its adjacent one as is shown in Figure 5. A

set of selection levers 228 are pivotally supported for independent movement on a common shaft 229 parallel to the bars 59 and a shortdistance below them.v Each of these levers 228 has a main body portion 231 substantially in alignment with that of the rest of said levers and an offset portion 232 particular to each lever terminating in a blocking portion 233. The blocking portions 233 of the particular ofiset portions 232 are each adapted to register with one of the notches 227 of the lower edges of code bars 59 when such code bar has been moved its limited distance in the opposite direction of the arrow side thereof with detent shoulders 53. Indi vidual to each of said shoulders 53 is a detent lever 44 while the several of such levers are mounted on a common shaft 237. An individual spring 238 is adapted to urge each of these detents 44 in a counterclockwise direction so that when its selection lever 228 is rotated clockwise until it hits the stop 239 the shoulder 53 will be'ciear of the end 241 of the detent 44 and such detent will then rotate counterclockwise'until it is stopped by the extension 242 of the shoulder 53.

The detents 44 may then remain in this position until the selective action of the levers 215 through their arms 195 impart a clockwise movement to said detents by virtue of the superior force of the spring elements of said levers 215, whereupon the selector levers I will be allowed to return to the position indicated in Figure 4 in response to the influence of their springs 243.

The selection levers 228 are reset as will hereinafter be explained by a resetting rod 244 adapted to engage their tail portions H!)!) while the code bars 59 are similarly reset by a bar lever 77 secured to a rocker shaft 7 for pivotal movement therewith.

A main drive shaft 29, receiving its power from a prime mover (not shown) through gear 2. is illustrated at a slightangle for arbitrary mechanical reasons. To this shaft 29 is secured a fixed member-92 of a toothclutch, while a floating member 245 is constantly urged into toothed engagement with it through the medium of a compression 3 spring 96. A cam sleeve 246 is freely mounted onsaid shaft 29 for independent rotational movement, but is confined from longitudinal movement in one direction by a collar 247 at one end thereof. Movement in .the other direction by said sleeve 246 is resisted by the action of the compression spring 96 which spring is confined between shouldered portions 248 and 81 of sleeve 246 and floating member 245, respectively. Concurrent ro- 3 tational movement of the floating member 245 and cam sleeve 246 is effected by means of a longitudinal tongue and groove connection 252.

The cam sleeve 246 provides three cam elements integral therewith. A peripheral cam 90 engages a roller 286 of an arm253 secured to the shaft 79 and is adapted to impart the necessary movement to the reset bar lever 77 which, as already described is also secured to the shaft 79. Another arm 254 which is secured to shaft 79 provides a pin 255 which, when the arm 253 is rotated, is disposed in the path of clutch cam 95. The pin 255 thus disposed presently engages the surface of cam 95, and by means of the incline of said cam,

disengages the floating member 245 from toothed engagement with fixed member 92, compressing the spring 96 while so doing.

When the apex of cam 90 passes its roller 286, the several parts securedv to shaft 79 assume. the position shown in broken lines in Figure 7. This position is maintained until the next group ofcode impulses has been received and set up on the selector levers 215, in the following manner. A pivoted lever 256 is normally biased by spring 258 so that one end of the lever tends to move into the path of lever 254 on shaft 79. When cam 90 oscillates lever 253 and lever 254 by movement of shaft 79 to the broken line position, Figure 7, the end of lever 256 at once moves upwardly to its dotted line position, due to-spring 258, to thus block subsequent oscillation of levers 253. and 254 counterclockwise'until lever 256 is operated.

In order to release lever 256, shaft 161 is provided with a cam 259 for cooperation with end 261 of lever 256, cam 259 being so arranged that it engages end 261 immediately following the reception of the last impulse of each code combination. Resultant downward movement of lever 256 releases lever 254 and spring 262 at once oscillates levers 254 and'253 and shaft 79 until roller 286 engages cam surface 90. VVhenroller 286 rides off high portion of cam 90, the parts are blocked in the broken line position, Figure 7, and clutch sleeve 245 is disengaged from driven part 92 when cam 95 engages pin 255 of lever 254. Thus the rotation of cam sleeve 246 is interrupted. This interruption is necessary to allow cam assembly 186 enough time to complete a new selection after which cam 259 on the shaft 161, engagesthe end 261 of lever 256. Lever 256 then releases arm 254 which through its spring 262 restores shaft 79 together with its secured parts to the con- ,dition shown in Figure 4.

A cylinder cam 91 also integral with cam sleeve 246 gives recipocal movement to the pull bar bail 263 through the cam roller 264 of depending arm 265. The bail 263 is pivoted upon a shaft 129, transverse of the main drive shaft 29, and includes end supports 126 which are joined by a rod 125 and a blade 128. e

The rod 125 as it describes an arc in its oscillatory movement about pivot 129 is adapted to cam up the several pull bars 108 to the dotted line position (Figure 4) through engagement with their-cam surfaces 267 while said rod is moving in its clockwise sense. 1 On its'return movement as urged by spring 268 the blade 128 is adapted to engage the shoulder 111 of anypull bar 108 that has been selected. A selected pull bar drops into the particular transverse row of code bar notches 225 that is aligned at each position of the code bars 59, previousl described.

' positions.

The pull bar so engaged is carried forward thus performing a specific operation.

The third cam 269 of the sleeve 246 is also a cylindrical cam having a relatively small apex 271 which is adapted to reset the selector levers 228 in the following manner. A resetting lever 27 2 which supports the resetting rod 244includes a projecting follower disposed in the path of the apex 271. Upon each revolution of the cam 269 the lever 272 is operated and the selection levers 228 are reset, 1

lln the operation of this mechanism shown in Figures 4 to 7 shaft 29 is continuously rotating while rotation of shaft 161 is periodically interrupted as explained in the description of Figures 1 to 3.

Upon the reception of a start impulse which is of spacing nature armature 179 assumes the position of Figure 3, thus releasing detent 170 and allowing rotation of driven shaft 161, as previously explained. As the notches 191 of the cam disks 186 align with portions 192 of selector levers 215, the position of armature 179 determines whether the individual selector levers 215 are allowed to move clockwise as shown in dotted lines (Figure 2) or are held in their full line We will assume that all of selecting levers 228, Figures 4 and 6, have been rotated clockwise by the previous movement of resetting lever 272 whereby each detent 44 has engaged the shoulder 242 of each lever 228. individual thereto.

Arms 253 and 254 and bar 77 secured to shaft 7 9 are latched in their dotted line positions, Figure 7, due to blocking lever 256 being in its latching position. If no selection has been previously set up, code bars 59 are held to their right hand position by bar 77 against the tension of their individual springs 65, with the notch 227 in the lower .edge of each code bar 59 adjacent the end of latching portion 233 of its individual selector lever 228, as shown diagrammatically in Figure 7 As each selector lever 215 now either is selectively moved to its counterclockwise position (if the code impulse is of marking nature) or is retained in its position in Figure 3 (if the impulse is of spacing nature), the

corresponding individual detent levers 44 are selectively tripped or let alone. Each detent lever 44 which is tripped by movement of its individual selector lever 215 moves clockwise,

Figure 4, to thereby free its individual selec tion lever 228. Each lever 228 thus freed assumes the position shown in Figure 4, due to its individual spring 243, whereby its latching or blocking portion 233 enters its corresponding code bar notch 227.

, When the selective positioning of levers 228 has been completed, cam 259 on driven shaft 161 raises end 261 to depress latching portion 256, Figures 4 and 7, against tension of 7 tion 256 out of engagement with lever 254 and spring 262 oscillates levers 253 and 254 counterclockwise carrying bar 77 to the left as shown in Figure 6. The bars 59 which are not latched by parts 233 on selected and operated selection levers 228 will then follow the movement of bar 77 under the influence of-their springs but no operation occurs as a result of such movement. Cam follower 264 will be on the apex of cam 91 and rod 125 will be holding all bars 108 in their upper position, preventing any bar 108 from entering the notches of code bars 59 although one set of notches now is aligned. Clutch spring 96 then causes engagement of the floating sleeve 245 with the driven member 92 and rotation of'cam sleeve 246 is initiated.

Operation of sleeve 246 first causes the high portion of cam 91 to move away from its follower 264, then rod 125 starts toward the left and when it reaches the position shown in Figure 4, all of the actuating bars 108 may drop into engagement with the notched upper surfaces 224 of code bars 59. The selected code bar 108 v, will now enter the aligned notches and will be lowered further than its companion bars. This condition of parts is the condition shown in Fig. 4, with the teeth of the clutch 24592 in engagement for driving the cam sleeve 246 and with the apex of the cam 91 some degrees away from its follower 264. The cam 271 is about to operate the resetting lever 272. The follower 264 is riding upon the ebb of the cam 91 and is permitting the rod 125 and blade 128 to move left under power of the'spring 268. Further counterclockwise movement of lever 263 causes bail blade 128 to engage the notched shoulder 111 of the selected pull bar. The selected pull bar is then forced to the left of Figure 4 to perform the operations individual to the selected bar.

Immediately after selected bar 108 drops into the aligned notches of bars 59, the high portion 271 of cam 269 engages lever 272, rotating said lever counterclockwise as viewed in Figure 4 to cause the resetting rod 244 to engage the tail portions 235 of selection levers 228, restoring the previously selected levers 228 to their unselected or latched position. The high portion of cam 271 then disengages from lever 272 freeing the selection levers 228 for movement in accordance with the succeeding code combination of impulses which proceeds as above-set forth, while the previously selected bar 108 is being moved through the aligned notches to effect the previously selected operation. From the above description of the operation, it will be clear that an overlap of sub-' stantially one complete cycle is provided.

'That is, thecode impulses as received on magnet 183, operate the selector levers 215 to 7, cam 259 is so arranged on cam 161 that and unlatch the selection levers 228 in code up on the selector levers 215.

Cam sleeve246, having now nearly completed one rotation, the rod 125 lifts all pull bars 108 out of contact with all code bars 59.

The lobe of cam 90 moves its follower 286 .to rock the shaft 79 and to operate the bar 77 and the arm 254. Bar 77 forces all'code bars 59 to the right (Fig. 6) and brings all notches 227 (Fig. 5) opposite their respective blocking ends 233 of the selection levers 228 and the unlatched levers 228 if any pass their ends 233 into the respective notches 227. Arm 254, having moved, is latched by the upward motion of the right end of lever 256. Finally, the high portion of cam 95 engages pin 255 of lever 254 which has been repositioned in its path, and the sleeve 246 is forced to the left of Figure 4 to disengage from the driven portion 92 and all parts come to rest execept shaft 161 and its cams which now are near the normal stop position. If a subsequent combination has been set up in the meantime, cam' 259 on shaft 161 will at once move the blocking portion of lever 256 downwardly to release the arm 254 which in turn releases the floating member 245 to reengage the clutch and the cycle of operations will be repeated. Should no subsequent start-pulse and code be received, then the shaft 161 will be at rest when the cam sleeve 246 comes to rest and all parts will remain at rest until the receipt of a starting signal upon magnet 183.

As previously explained in detail in connection with Figures 1 to 3, the printer of Figures 4 to 7 operates on the start-stop prin ciple and each code combination of impulses is preceded by a' start condition of spacing nature and is followed by a stop condition of marking nature. If through inadvertence the receiving magnet 183 is continuously receiving a start impulse of spacing nature, the mechanism is prevented from continuously operating by the auxiliary stop pin 185, which will engage arm 219 of the lever 177 and thus stop rotation of the shaft 161. In order to prevent unnecessary operation of theparts of the printer shown in Figures 4 the high portion thereof will operate the blocking extension 256 just subsequent to the passing of in 185 beyond extension 221 of the lever 1 7. Thus if the magnet 183 is continuously receiving a start impulse of spacing nature, so that pin 185 is arrested to prevent rotation of shaft 161, the selecting printing mechanisms shown in Figures 4 to 7 will also be stopped at this time, since the means blocking portion 256 will remain in position to hold the floating member 245 out of engagement with the driven portion 92 of the clutch. The parts will remain in this pos1- tion until a stop condition of marking nature is received.

Although the invention has been described in connection with a printing receiver, it is obviously not so limited, being adapted for use with any type of'selective remote control receiving mechanism.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of eguivalency of the claims is therefore inten ed to be embraced therein.

What is claimed and is desired to be secured by Letters Patent is:

1. In a start-stop telegraphic selector responsive toreceived code combinations of selecting conditions, arresting means con trolled by a stop condition, and other arresting means controlled by the last selecting condition of a code combination.

2. A rotary selector mechanism including a start-stop rotor, starting means responsive to a uniform signalling condition at the beginning of a signal and stopping means responsive to a plurality of different signalling conditions at the close of a signal.

3. In a start-stop rotary selector adapted to be controlled by varying line conditions, a start-stop means, a principal engagement mechanism and an alternative engagement :mechanism controlled respectively by different line conditions of said varying line conditions whereby said selector is arrested within the period of each cycle of its operation irrespective of the line condition at the instant of stopping.

4. In a start-stop selector, receiving means invariably started into selective action at the beginning of a signal by a start condition of one characteristic, stopped from its selective action by an impulse of the same characteristic, and conditioned for starting by an impulse of another characteristic, and selective mechanism variably controlled by said receiving means.

5. In a start-stop telegraphic receiver an element operated by signals comprised of code combinations of two electrical current conditions, a rotary selector started into selec-.

tive action by the first condition of a code combination, means to stop the action of said selector in subnormal angular position by one of said conditions, and means to stop the action of said selector in normal angular position by the other of said conditions.

'6, ln a, telegraph receiving mechanism'a plurality otselector elements, "a rotatable selector cooperative with each of said elements, a pair 6f mechanical stop means of alternative application whereby said rotatable selector is arrested within the limit of one cycle of operation irrespec'ti e of the characteristic of line signals.

1 7. In a telegraph receiving system, a rotatable-element started into selective action by ,a' signal impulse of one characteristic, and

means for arresting said element within a slngle cycle of operation in the event of a prolongation'o t said impulse.

8. lln a telegraph recelver, aplurality 0t selector elements, a rotary notched cam selector for successively actuating said elements, a yleldable stop means" for arresting rotatlon of said selector 1n accordance with line cond tions of one characteristic, and a supplemental means for latching said stop means in the aforementioned condition and providing a stop for said selector during line conditions of a different characteristic 9. ln a start-stop telegraphicreceiver, a

selector selectively controlled by a plurality of conditions according to the permutations ortwo characteristics for each condition,

means tor arresting said selector controlled by oneot the permuted conditions, and turther means "for arresting said selector and controlled'by a condition not permuted.

l0. in a start-stop selector operated by signals comprised'ot two electrical c onditions, a rotor started. into selective action at the beginning of each signal, and two means responsive respectively to either of said conditions to stop the action of said rotor at the end cit each signal,

ll. lln a printing telegraph selectorpm eans responsive to a start condition for initiating a selection cycle, receiving means responsive to said first mentioned means and selectively responsive to a plurality of code conditions,

and means responsive to a code condition'tor arresting said receiving means and responsive to a stop condition tor restoring a normal condition of said selector preparatory for another cycle.

112; lln a printing telegraph receivena selector started into selective action at the be-' ginning of a signal and automatically stopped at the end of a signal, an auxiliary stop adapt ed to arrest selective actipn during abnormal conditions, and means to render the selector ready to start from its mormal stop condition when normal conditions are restored.

13. llna telegraph receiver, a rotary selector operable in cycles-{means for starting said selector into selective actiorl at the beginning ot a code signal in response to a start impulse, means for arresting said actionin response to a stop signal, and means for restoring saidselector to a condition from whence it may againbestarted, at the beginning of a cycle of operation by a start signal.

14. In a telegraph receiver having a startstop selector, means for starting said selector into selective action by a start condition at the beginning of a signal, and stopping-means for arresting said action at the end of a signal comprising two stop means operable successively.

15. A selector mechanism including a plu rality of selectors, a rotary actuator individualto each of said selectors for successively actuating said'selectors, a yielding stop com prising an engaging tooth and an arm, a stop member for engagement with said tooth, and a latch for engaging said 'arm during impulse ber in accordance with line conditions, and

an v alternative start-stop means for arresting sald rotor in accordance with signals comprising varying electrical conditions.

'l'Z/ln a start-stop telegraph receiving mechanism, a-rotary actuator comp-rising a plurality oli radially successive cam notches, selector levers operable individually by said notches, control means for permitting or preventing the movement of said levers by said notches in accordance with received signals, and double acting stop means for arresting the rotation of said actuator at the conclusion of a signal in accordance witheither of two signalling conditions.

18. lln a start-stop telegraph receiver, a rotary actuate comprising a plurality of notched cams, selector levers corresponding to each of said cams provided with follower portions tor'engagement therewith, a signal responsive element, a control member operable by said signal element to permit or pre- -vent said follower portions from being controlled by said cams, a yieldable stopmember adapted to engage said actuator, a latch means for locking said stop member in accordance with certain line signals, and a supplemental stop member for arresting said actuator in accordance with certain other signals to hold saidactuator in abeyance at the conclusion of a signalregardless of the final electrical characteristic of the signal.

19., ln a start-stop telegraphic selector a setof aligned selector levers, providing fol lower and locking portions, a. set of rotaryi cams one individual to each ol said levers by permit or prevent selective action of said levers inaccordance with varying line cony ditions, a yieldable stop member for arresting motion of said rotary cams providing an engagement pawl and alatch arm, a stop arm secured to said set of rotary cams for selecting condition, and means for arresting the rotation thereof at theend of each selective combination. M

. 27. In a printing telegraph receiver comprising a selector magnet responsive to received code combinations of impulses, a plurality of selectors, spring means for operating said selectors and means controlled by said magnet to selectively release said spring engagement with said pawl, and a supplemeans .for operating said selectors.

mental stop member providing a latch portion for locking said first mentioned stop byline of the conditions member during a signalling condition of one. characteristic and a blocking portion for arresting said rotary cams during a signalling condition of another characteristic.

20. In a selecting system comprising a receiver selectively responsive to cycles of definitely timed electrical conditions, each made up of a predetermined selective operation initiating condition, a plurality of selecting conditions, and a selective operation arrest ing condition; the'method of maintaining properly timed speed relations between said receiver and said timed conditions which comprises the step of utilizing one of said se- 128. In a printing telegraph receiver, an

.electro-magnet responsive to the impulses of a code combination of impulses, a plurality of fingers operable under control-of said electroma et, said fingers being latched in normal position and means for releasing only such fingers that do not enter positively into the succeeding combination of impulses.

Intestimony whereof I afiix my signature.

EDWARD E. KLEINSCHMIDT.

lectin g conditions between said initiating and said arresting conditions to arrest the selective operation of said receiver until proper speed relations are established.

.21. The method as set forth in claim 20 in which the last selecting condition of a cycle is utilized to arrest the selective operation.

22. The method as set forth in claim 20 in.

which the selecting condition affects the speed relations only when it difl'ers in character from the arresting condition.

23. A selecting receiver comprising means responsive to a predetermined electrical condition for initiating selective operation thereof, selectable means variably responsiveto code combinations of marking and spacing conditions during said selective operation, means responsive to a predetermined condition to arrest said selective operation after said code combinations of conditions have been received, and means for-correcting the timing of operation of said receiver controlled of said code combination:

24-. The combination as set forth in claim 23 in which said last mentioned means is controlled by the'lastcondition of said code com bination.

25. The combination asset fort-hfin claim 23, in which said last mentioned means is controlled by the last condition of said code combinations and only becomes effective when 

